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| author | Felipe Balbi <felipe.balbi@linux.intel.com> | 2017-06-07 13:07:01 +0200 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2017-06-13 12:21:04 +0200 |
| commit | 104165686ea388ddec6ec2834bf2c13873fbe91a (patch) | |
| tree | 376b8558c45f55d0e367780f96068cef02331721 | |
| parent | usb: gadget: dummy: implement ->udc_set_speed() (diff) | |
| download | linux-104165686ea388ddec6ec2834bf2c13873fbe91a.tar.xz linux-104165686ea388ddec6ec2834bf2c13873fbe91a.zip | |
usb: gadget: udc: add a 'function' sysfs file
This file will print out the name of the currently running USB Gadget
Driver. It can be read even when there are no functions loaded.
Suggested-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
| -rw-r--r-- | Documentation/ABI/stable/sysfs-class-udc | 8 | ||||
| -rw-r--r-- | drivers/usb/gadget/udc/core.c | 13 |
2 files changed, 21 insertions, 0 deletions
diff --git a/Documentation/ABI/stable/sysfs-class-udc b/Documentation/ABI/stable/sysfs-class-udc index 85d3dac2e204..7370deb87f87 100644 --- a/Documentation/ABI/stable/sysfs-class-udc +++ b/Documentation/ABI/stable/sysfs-class-udc @@ -91,3 +91,11 @@ Description: 'configured', and 'suspended'; however not all USB Device Controllers support reporting all states. Users: + +What: /sys/class/udc/<udc>/function +Date: June 2017 +KernelVersion: 4.13 +Contact: Felipe Balbi <balbi@kernel.org> +Description: + Prints out name of currently running USB Gadget Driver. +Users: diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c index eec388bccb25..08facbada30e 100644 --- a/drivers/usb/gadget/udc/core.c +++ b/drivers/usb/gadget/udc/core.c @@ -1460,6 +1460,18 @@ static ssize_t state_show(struct device *dev, struct device_attribute *attr, } static DEVICE_ATTR_RO(state); +static ssize_t function_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct usb_udc *udc = container_of(dev, struct usb_udc, dev); + struct usb_gadget_driver *drv = udc->driver; + + if (!drv || !drv->function) + return 0; + return scnprintf(buf, PAGE_SIZE, "%s\n", drv->function); +} +static DEVICE_ATTR_RO(function); + #define USB_UDC_SPEED_ATTR(name, param) \ ssize_t name##_show(struct device *dev, \ struct device_attribute *attr, char *buf) \ @@ -1495,6 +1507,7 @@ static struct attribute *usb_udc_attrs[] = { &dev_attr_srp.attr, &dev_attr_soft_connect.attr, &dev_attr_state.attr, + &dev_attr_function.attr, &dev_attr_current_speed.attr, &dev_attr_maximum_speed.attr, |